webui-aria2/js/directives/dgraph.js

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// graph takes dspeed and uspeed, it queries them every second and draws
// the last 180 secs, it also takes draw as an optional attribute and only
// draws the graph when it is true, if not given then graph is always drawn
angular
.module('webui.directives.dgraph', ['webui.filters.bytes', 'webui.services.deps'])
.directive('dgraph', ['$', '$filter', '$parse', function($, filter, parse) {
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var ratio = 0.4;
var xfmt = "%H:%M:%S";
var yTicks = 7; // Number of y-axis ticks (sans 0)
var yTickBase = 10240; // y-axis ticks must be a multiple of this (bytes).
try {
// Try to detect AM/PM locales.
if (!/16/.test(new Date(2000,0,1,16,7,9).toLocaleTimeString())) {
xfmt = "%I:%M:%S %P";
}
}
catch (ex) {
// Ignore. Browser does not support toLocaleTimeString.
}
return function(scope, elem, attrs) {
var canDraw = false;
var graphSize = 180
, dspeed = 0, uspeed = 0, hasSpeeds = false
, dconf = {
label: "DOWN",
data: [],
color: "#00ff00",
lines: { show: true }
}
, uconf = {
label: "UP",
data: [],
color: "#0000ff",
lines: { show: true }
}
;
// hack for the null height for flot elem
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elem.height(elem.width() * ratio);
var graph = $.plot(elem, [dconf, uconf], {
legend: {
show: true,
backgroundOpacity: 0,
margin: [10, 20],
labelFormatter: function(label, series) {
if (!series.data.length) {
return label;
}
return label + " (" + filter("bspeed")(series.data[series.data.length-1][1]) + ")";
},
position: "sw"
},
xaxis: {
show: true,
mode: "time",
timeformat: xfmt,
minTickSize: [30, "second"] // 180 / 30 == 6
},
yaxis: {
position: "right",
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ticks: function(axis) {
var res = [0];
var round = Math.max(1, Math.ceil(axis.max / yTickBase));
var step = Math.max(1, Math.ceil(round / yTicks));
for (var s = 1; s <= yTicks; ++s) {
var c = yTickBase * step * s;
res.push(c);
if (c > axis.max) {
break;
}
}
return res;
},
tickFormatter: function(val, axis) {
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return filter('bspeed')(val);
},
min: 0
}
});
var draw = function() {
var width = elem.width();
if (width == 0) return;
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elem.height(width * ratio);
graph.setData([dconf, uconf]);
graph.resize();
graph.setupGrid();
graph.draw();
};
function update() {
if (!hasSpeeds) {
return;
}
// Convoluted way to get the local date timestamp instead of the UTC one.
var cnt = new Date();
cnt = Date.UTC(
cnt.getFullYear(),
cnt.getMonth(),
cnt.getDate(),
cnt.getHours(),
cnt.getMinutes(),
cnt.getSeconds());
if (dconf.data.length === graphSize) dconf.data.shift();
dconf.data.push([cnt, dspeed]);
if (uconf.data.length === graphSize) uconf.data.shift();
uconf.data.push([cnt, uspeed]);
// if any parents is collapsable, then confirm if it isnt
if (canDraw) {
draw();
}
};
scope.$watch(attrs.dspeed, function(val) {
if (val === undefined) {
return;
}
hasSpeeds = true;
dspeed = parseFloat(val) || 0;
});
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scope.$watch(attrs.uspeed, function(val) {
if (val === undefined) {
return;
}
hasSpeeds = true;
uspeed = parseFloat(val) || 0;
});
scope.$watch(attrs.draw, function(val) {
canDraw = val;
});
var interval = setInterval(update, 1000);
angular.element(window).bind('resize', draw);
elem.bind('$destroy', function() {
clearInterval(interval);
});
};
}]);